Mobile device and optical imaging lens thereof

ABSTRACT

Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises five lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces and/or the refracting power of the lens elements, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

INCORPORATION BY REFERENCE

This application claims priority from P.R.C. Patent Application No.201310216275.4, filed on Jun. 3, 2013, the contents of which are herebyincorporated by reference in their entirety for all purposes.

TECHNICAL FIELD

The present invention relates to a mobile device and an optical imaginglens thereof, and particularly, relates to a mobile device applying anoptical imaging lens having five lens elements and an optical imaginglens thereof.

BACKGROUND

Dimension reduction is the major consideration for designing an opticalimaging lens in recent years. When reducing the length of the opticalimaging lens, however, achieving good optical characteristics becomes achallenging problem.

U.S. Pat. No. 7,480,105, U.S. Pat. No. 7,639,432, U.S. Pat. No.7,486,449 and U.S. Pat. No. 7,684,127 all disclosed an optical imaginglens constructed with an optical imaging lens having five lens elements.The transition of refracting power of the first two lens elements inU.S. Pat. No. 7,480,105 and U.S. Pat. No. 7,639,432 isnegative-positive, and that in U.S. Pat. No. 7,486,449 and U.S. Pat. No.7,684,127 are both negative-negative. However, such configurations stillfail to achieve good optical characteristics, and further, fail toreduce the size of the whole system, because the lengths of the opticalimaging lenses thereof fall into the range of 10˜18 mm.

U.S. Pat. No. 8,233,224, U.S. Pat. No. 8,363,337 and U.S. Pat. No.8,000,030 all disclosed an optical imaging lens constructed with anoptical imaging lens having five lens elements. The transition ofrefracting power of the first two lens elements in these three documentsis the better positive-negative. However, the configurations of thesurface shapes from the third to fifth lens elements thereof areunfavorable for improving the optical aberrations and meanwhileshortening the length of the optical imaging lens, therefore, forachieving better imaging quality, the lengths of the imaging lens areunable to be shortened. For example, the lengths of some imaging lensreach 6.0 mm, and this needs for improvement.

Therefore, there is needed to develop optical imaging lens with ashorter length, while also having good optical characters.

SUMMARY

An object of the present invention is to provide a mobile device and anoptical imaging lens thereof. With controlling the convex or concaveshape of the surfaces and/or the refracting power of the lens elements,the length of the optical imaging lens is shortened and meanwhile thegood optical characters, and system functionality are sustained.

In an exemplary embodiment, an optical imaging lens comprises,sequencially from an object side to an image side along an optical axis,comprises an aperture stop, first, second, third, fourth and fifth lenselements, each of the first, second, third, fourth and fifth lenselements having an object-side surface facing toward the object side andan image-side surface facing toward the image side, wherein: the firstlens element has positive refracting power, and the object-side surfacethereof is a convex surface; the second lens element has negativerefracting power, and the image-side surface thereof comprises a concaveportion in a vicinity of a periphery of the second lens element; theobject-side surface of the third lens element comprises a convex portionin a vicinity of a periphery of the third lens element; the object-sidesurface of the fourth lens element is a concave surface; the object-sidesurface of the fifth lens element comprises a concave portion in avicinity of a periphery of the fifth lens element, and the image-sidesurface of the fifth lens element comprises a concave portion in avicinity of the optical axis and a convex portion in a vicinity of aperiphery of the fifth lens element; and the optical imaging lens as awhole comprises only the five lens elements having refracting power.

In another exemplary embodiment, some equation(s), such as thoserelating to the ratio among parameters could be taken intoconsideration. For example, a central thickness of the first lenselement along the optical axis, T1, a central thickness of the thirdlens element along the optical axis, T3, and a central thickness of thefifth lens element along the optical axis, T5, could be controlled tosatisfy the equation as follows:

(T1+T5)/T3≦2.400  Equation (1); or

An air gap between the first lens element and the second lens elementalong the optical axis, AG12, and an air gap between the second lenselement and the third lens element along the optical axis, AG23, couldbe controlled to satisfy the equation(s) as follows:

AG23/AG12≦2.200  Equation (2); or

T5 and AG12 could be controlled to satisfy the equation as follows:

T5/AG12≦4.400  Equation (3); or

AG12 and a central thickness of the second lens element along theoptical axis, T2, could be controlled to satisfy the equation asfollows:

T2/AG12≦2.300  Equation (4); or

T2 and AG23 could be controlled to satisfy the equation as follows:

T2/AG23≦1.000  Equation (5); or

T3 and AG12 could be controlled to satisfy the equation as follows:

T3/AG12≦3.000  Equation (6); or

T2 and the sum of all four air gaps from the first lens element to thefifth lens element along the optical axis, AAG, could be controlled tosatisfy the equation as follows:

3.450≦AAG/T2  Equation (7); or

AG12 and an air gap between the third lens element and the fourth lenselement along the optical axis, AG34, could be controlled to satisfy theequation as follows:

AG34/AG12≦3.400  Equation (8); or

T2 and a central thickness of the fourth lens element along the opticalaxis, T4, could be controlled to satisfy the equation as follows:

T2/T4≦0.480  Equation (9); or

T1 and AG23 could be controlled to satisfy the equation as follows:

T1/AG23≦2.050  Equation (10); or

T4, T5 and an air gap between the fourth lens element and the fifth lenselement along the optical axis, AG45, could be controlled to satisfy theequation as follows:

(T5+AG45)/T4≦1.150  Equation (11); or

T1 and T4 could be controlled to satisfy the equation as follows:

T1/T4≦0.950  Equation (12); or

AG23 and the sum of the thickness of all five lens elements along theoptical axis, ALT, could be controlled to satisfy the equation asfollows:

ALT/AG23≦9.000  Equation (13).

Aforesaid exemplary embodiments are not limited and could be selectivelyincorporated in other embodiments described herein.

In some exemplary embodiments, more details about the convex or concavesurface structure or the refracting power of the lens element(s) couldbe incorporated for one specific lens element or broadly for plural lenselements to enhance the control for the system performance and/orresolution. For example, the image-side surface of the first lenselement may further comprise a concave portion in a vicinity of aperiphery of the first lens element, the object-side surface of thesecond lens element may further comprise a convex portion in a vicinityof a periphery of the second lens element, the image-side surface of thethird lens element may further comprise a convex portion in a vicinityof the optical axis and/or the object-side surface of the fifth lenselement may further comprise a concave portion in a vicinity of theoptical axis, etc. It is noted that the details listed here could beincorporated in example embodiments if no inconsistency occurs.

In another exemplary embodiment, a mobile device comprising a housingand a photography module positioned in the housing is provided. Thephotography module comprises any of aforesaid example embodiments ofoptical imaging lens, a lens barrel, a module housing unit, a substrateand an image sensor. The lens barrel is for positioning the opticalimaging lens, the module housing unit is for positioning the lensbarrel, the substrate is for positioning the module housing unit; andthe image sensor is positioned on the substrate and at the image side ofthe optical imaging lens.

Through controlling the convex or concave shape of the surfaces and/orthe refracting power of the lens element(s), the mobile device and theoptical imaging lens thereof in exemplary embodiments achieve goodoptical characters and effectively shorten the length of the opticalimaging lens.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 is a cross-sectional view of one single lens element according tothe present disclosure;

FIG. 2 is a cross-sectional view of a first embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 3 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a first embodiment of the optical imaging lensaccording to the present disclosure;

FIG. 4 is a table of optical data for each lens element of a firstembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 5 is a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosure;

FIG. 6 is a cross-sectional view of a second embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 7 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a second embodiment of the optical imaginglens according to the present disclosure;

FIG. 8 is a table of optical data for each lens element of the opticalimaging lens of a second embodiment of the present disclosure;

FIG. 9 is a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosure;

FIG. 10 is a cross-sectional view of a third embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 11 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a third embodiment of the optical imaging lensaccording the present disclosure;

FIG. 12 is a table of optical data for each lens element of the opticalimaging lens of a third embodiment of the present disclosure;

FIG. 13 is a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 is a cross-sectional view of a fourth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 15 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fourth embodiment of the optical imaginglens according the present disclosure;

FIG. 16 is a table of optical data for each lens element of the opticalimaging lens of a fourth embodiment of the present disclosure;

FIG. 17 is a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 is a cross-sectional view of a fifth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 19 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fifth embodiment of the optical imaging lensaccording the present disclosure;

FIG. 20 is a table of optical data for each lens element of the opticalimaging lens of a fifth embodiment of the present disclosure;

FIG. 21 is a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 is a cross-sectional view of a sixth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 23 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a sixth embodiment of the optical imaging lensaccording the present disclosure;

FIG. 24 is a table of optical data for each lens element of the opticalimaging lens of a sixth embodiment of the present disclosure;

FIG. 25 is a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 is a cross-sectional view of a seventh embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 27 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a seventh embodiment of the optical imaginglens according the present disclosure;

FIG. 28 is a table of optical data for each lens element of the opticalimaging lens of a seventh embodiment of the present disclosure;

FIG. 29 is a table of aspherical data of a seventh embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 is a cross-sectional view of a eighth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 31 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a eighth embodiment of the optical imaginglens according the present disclosure;

FIG. 32 is a table of optical data for each lens element of the opticalimaging lens of a eighth embodiment of the present disclosure;

FIG. 33 is a table of aspherical data of a eighth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 34 is a cross-sectional view of a ninth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 35 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a ninth embodiment of the optical imaging lensaccording the present disclosure;

FIG. 36 is a table of optical data for each lens element of the opticalimaging lens of a ninth embodiment of the present disclosure;

FIG. 37 is a table of aspherical data of a ninth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 38 is a table for the values of ALT, AAG, (T1+T5)/T3, AG23/AG12,T5/AG12, T2/AG12, T2/AG23, T3/AG12, AAG/T2, AG34/AG12, T2/T4, T1/AG23,(T5+AG45)/T4, T1/T4 and ALT/AG23 of all ninth example embodiments;

FIG. 39 is a structure of an example embodiment of a mobile device;

FIG. 40 is a partially enlarged view of the structure of another exampleembodiment of a mobile device.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, although itmay, and various example embodiments may be readily combined andinterchanged, without departing from the scope or spirit of the presentinvention. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the invention. In this respect, as used herein, the term“in” may include “in” and “on”, and the terms “a”, “an” and “the” mayinclude singular and plural references. Furthermore, as used herein, theterm “by” may also mean “from”, depending on the context. Furthermore,as used herein, the term “if” may also mean “when” or “upon”, dependingon the context. Furthermore, as used herein, the words “and/or” mayrefer to and encompass any and all possible combinations of one or moreof the associated listed items.

Here in the present specification, “a lens element having positiverefracting power (or negative refracting power)” means that the lenselement has positive refracting power (or negative refracting power) inthe vicinity of the optical axis. “An object-side (or image-side)surface of a lens element comprises a convex (or concave) portion in aspecific region” means that the object-side (or image-side) surface ofthe lens element “protrudes outwardly (or depresses inwardly)” along thedirection parallel to the optical axis at the specific region, comparedwith the outer region radially adjacent to the specific region. TakingFIG. 1 for example, the lens element shown therein is radially symmetricaround the optical axis which is labeled by I. The object-side surfaceof the lens element comprises a convex portion at region A, a concaveportion at region B, and another convex portion at region C. This isbecause compared with the outer region radially adjacent to the region A(i.e. region B), the object-side surface protrudes outwardly at theregion A, compared with the region C, the object-side surface depressesinwardly at the region B, and compared with the region E, theobject-side surface protrudes outwardly at the region C. Here, “in avicinity of a periphery of a lens element” means that in a vicinity ofthe peripheral region of a surface for passing imaging light on the lenselement, i.e. the region C as shown in FIG. 1. The imaging lightcomprises chief ray Lc and marginal ray Lm. “In a vicinity of theoptical axis” means that in a vicinity of the optical axis of a surfacefor passing the imaging light on the lens element, i.e. the region A asshown in FIG. 1. Further, a lens element could comprise an extendingportion E for mounting the lens element in an optical imaging lens.Ideally, the imaging light would not pass the extending portion E. Herethe extending portion E is only for example, the structure and shapethereof are not limited to this specific example. Please also noted thatthe extending portion of all the lens elements in the exampleembodiments shown below are skipped for maintaining the drawings cleanand concise.

Example embodiments of an optical imaging lens may comprise an aperturestop, a first lens element, a second lens element, a third lens element,a fourth lens element and a fifth lens element, each of the lenselements comprises an object-side surface facing toward an object sideand an image-side surface facing toward an image side. These lenselements may be arranged sequencially from the object side to the imageside along an optical axis, and example embodiments of the lens as awhole may comprise only the five lens elements having refracting power.In an example embodiment: the first lens element has positive refractingpower, and the object-side surface thereof is a convex surface; thesecond lens element has negative refracting power, and the image-sidesurface thereof comprises a concave portion in a vicinity of a peripheryof the second lens element; the object-side surface of the third lenselement comprises a convex portion in a vicinity of a periphery of thethird lens element; the object-side surface of the fourth lens elementis a concave surface; the object-side surface of the fifth lens elementcomprises a concave portion in a vicinity of a periphery of the fifthlens element, and the image-side surface of the fifth lens elementcomprises a concave portion in a vicinity of the optical axis and aconvex portion in a vicinity of a periphery of the fifth lens element.

Preferably, the lens elements are designed in light of the opticalcharacteristics and the length of the optical imaging lens. For example,combining the aperture stop positioned before the first lens elementwith the first lens element having positive refracting power to providethe positive refracting power required in the optical imaging lens andthe second lens element having negative refracting power to assist ineliminating aberration, light converge ability of the optical imaginglens could be promoted to shorten the length thereof. All the details ofshape on the surfaces of the lens elements, such as the concave portionin a vicinity of a periphery of the second lens element on theimage-side surface thereof, the convex portion in a vicinity of aperiphery of the third lens element on the object-side surface thereof,the concave object-surface of the fourth lens element, the concaveportion in a vicinity of a periphery of the fifth lens element on theobject-side surface thereof, the concave portion in a vicinity of theoptical axis on the image-side surface of the fifth lens element and theconvex portion in a vicinity of a periphery of the fifth lens element onthe image-side surface thereof, could assist in eliminating theaberration of the optical imaging lens. Further, the aberration could beeliminated even more with additional details of shade, such as a concaveportion in a vicinity of a periphery of the first lens element on theimage-side surface thereof, a convex portion in a vicinity of aperiphery of the second lens element on the object-side surface thereof,a convex portion in a vicinity of the optical axis on the image-sidesurface of the third lens element and/or a concave portion in a vicinityof the optical axis on the object-side surface of the fifth lenselement. Additionally, all these details could promote the image qualityof the whole system.

In another exemplary embodiment, some equation(s) of parameters, such asthose relating to the ratio among parameters could be taken intoconsideration. For example, a central thickness of the first lenselement along the optical axis, T1, a central thickness of the thirdlens element along the optical axis, T3, and a central thickness of thefifth lens element along the optical axis, T5, could be controlled tosatisfy the equation as follows:

(T1+T5)/T3≦2.400  Equation (1); or

An air gap between the first lens element and the second lens elementalong the optical axis, AG12, and an air gap between the second lenselement and the third lens element along the optical axis, AG23, couldbe controlled to satisfy the equation(s) as follows:

AG23/AG12≦2.200  Equation (2); or

T5 and AG12 could be controlled to satisfy the equation as follows:

T5/AG12≦4.400  Equation (3); or

AG12 and a central thickness of the second lens element along theoptical axis, T2, could be controlled to satisfy the equation asfollows:

T2/AG12≦2.300  Equation (4); or

T2 and AG23 could be controlled to satisfy the equation as follows:

T2/AG23≦1.000  Equation (5); or

T3 and AG12 could be controlled to satisfy the equation as follows:

T3/AG12≦3.000  Equation (6); or

T2 and the sum of all four air gaps from the first lens element to thefifth lens element along the optical axis, AAG, could be controlled tosatisfy the equation as follows:

3.450≦AAG/T2  Equation (7); or

AG12 and an air gap between the third lens element and the fourth lenselement along the optical axis, AG34, could be controlled to satisfy theequation as follows:

AG34/AG12≦3.400  Equation (8); or

T2 and a central thickness of the fourth lens element along the opticalaxis, T4, could be controlled to satisfy the equation as follows:

T2/T4≦0.480  Equation (9); or

T1 and AG23 could be controlled to satisfy the equation as follows:

T1/AG23≦2.050  Equation (10); or

T4, T5 and an air gap between the fourth lens element and the fifth lenselement along the optical axis, AG45, could be controlled to satisfy theequation as follows:

(T5+AG45)/T4≦1.150  Equation (11); or

T1 and T4 could be controlled to satisfy the equation as follows:

T1/T4≦0.950  Equation (12); or

AG23 and the sum of the thickness of all five lens elements along theoptical axis, ALT, could be controlled to satisfy the equation asfollows:

ALT/AG23≦9.000  Equation (13).

Aforesaid exemplary embodiments are not limited and could be selectivelyincorporated in other embodiments described herein.

Reference is now made to Equation (1). (T1+T5)/T3 is composed by thethickness of the three lens elements which require some conditions orshow some characters: the first lens element having positive refractingpower which is relative thicker than that of the rest lens elementsshould be restrained in a proper range, the thickness of the fifth lenselement is usually quite thin due to the concave portion in a vicinityof the optical axis formed on the image-side surface thereof, and thethickness of the third lens element is required for a certain value tomake the configuration of the thickness of these three lens elementproper, and these form a cap of the value of (T1+T5)/T3. The value of(T1+T5)/T3 is preferably smaller than or equal to 2.400 to satisfyEquation (1). Additionally, the value of (T1+T5)/T3 is suggested for alower limit, such as 1.200≦(T1+T5)/T3≦2.400.

Reference is now made to Equation (2). AG23/AG12 is composed by two airgaps which require some conditions or show some characters: the air gapbetween the second and third lens elements is usually quite big due tothe concave portion in a vicinity of a periphery of the second lenselement formed on the image-side surface thereof and required forshortened, the air gap between the first and second lens elements isrequired for a sufficient value for facilitating mounting process, andthese form a cap of the value of AG23/AG12. The value of AG23/AG12 ispreferable less than or equal to 2.200 to satisfy Equation (2).Additionally, the value of AG23/AG12 is suggested for a lower limit,such as 0.900≦AG23/AG12≦2.200.

Reference is now made to Equation (3). As mentioned above, T5 isrelative small and AG12 is relative big. These characters form a cap ofthe value of T5/AG12. The value of T5/AG12 is preferable less than orequal to 4.400 to satisfy Equation (3). Additionally, the value ofT5/AG12 is suggested for a lower limit, such as 1.500≦T5/AG12≦4.400.

Reference is now made to Equations (4). T2/AG12 is composed by twoparameters which require some conditions or show some characters: T2 isusually relative small due to the negative refracting power owned by thesecond lens element, and AG12 is required for a sufficient value forfacilitating mounting process. The value of T2/AG12 is preferable lessthan or equal to 2.300 to satisfy Equation (4). Additionally, the valueof T2/AG12 is suggested for a lower limit, such as 0.900≦T2/AG12≦2.300.

Reference is now made to Equation (5). As mentioned before, T2 isusually relative small. In light of this, and for a better configurationof T2 and the air gap around the second lens element, we use T2/AG23 tocontrol these parameters. The value of T2/AG23 is preferable smallerthan or equal to 1.000 to satisfy Equation (5). Additionally, the valueof T2/AG23 is suggested for a lower limit, such as 0.600≦T2/AG23≦1.00.

Reference is now made to Equation (6). As mentioned above, AG12 isusually relative big, and this forms a cap of the value of T3/AG12. Thevalue of T3/AG12 is preferable smaller than or equal to 3.000 to satisfyEquation (6). Additionally, the value of T3/AG12 is suggested for alower limit, such as 1.500≦T3/AG12≦3.000.

Reference is now made to Equation (7). As mentioned above, T2 is usuallyrelative small, but the sum of each air gap (i.e. AAG) is preferablyrequired for a sufficient value for facilitating mounting process. Thus,a lower limit for the value of AAG/T2 is formed, and AAG/T2 ispreferable greater than or equal to 3.450 to satisfy Equation (7).Additionally, the value of AAG/T2 is suggested for an upper limit, suchas 3.450≦AAG/T2≦6.500.

Reference is now made to Equation (8). AG34/AG12 is constructed by twoparameters which require some conditions or show some characters: AG34is required for avoiding an excessive value which may come from theconcave object-surface of the fourth lens element, and AG12 is usuallyrelative big as mentioned. The value of AG34/AG12 is preferable smallerthan or equal to 3.400 to satisfy Equation (8). Additionally, the valueof AG34/AG12 is suggested for a lower limit, such as1.000≦AG34/AG12≦3.400.

Reference is now made to Equation (9). As mentioned before, T2 isusually relative small, and the shortening of the value of T4 is limitedby the significant effective diameter of the fourth lens element. Thus,we use T2/T4 to modulate these parameters. The value of T2/T4 ispreferable smaller than or equal to 0.480 to satisfy Equation (9).Additionally, the value of T2/T4 is suggested for a lower limit, such as0.200≦T2/T4≦0.480.

Reference is now made to Equation (10). As mentioned above, T1 isusually relative small. Therefore, we use T1/AG23 to control theconfiguration of the values of T1 and AG23. The value of T1/AG23 ispreferable smaller than or equal to 2.050 to satisfy Equation (10).Additionally, the value of T1/AG23 is suggested for a lower limit, suchas 1.000≦T1/AG23≦2.050.

Reference is now made to Equation (11). Here we use (T5+AG45)/T4 forcontrolling the configuration of the thickness of the fourth and fifthlens element and the air gap between them to eliminate aberration. Thevalue of (T5+AG45)/T4 is preferable less than or equal to 1.150 tosatisfy Equation (11). Additionally, the value of (T5+AG45)/T4 issuggested for a lower limit, such as 0.700≦(T5+AG45)/T4≦1.150.

Reference is now made to Equation (12). As mentioned above, T1 isusually relative small, and T4 is less likely to be shortened due to itsrelative great effective diameter. Therefore, we use T1/T4 to controlthe configuration of the values of T1 and T4. The value of T1/T4 ispreferable smaller than or equal to 0.950 to satisfy Equation (12).Additionally, the value of T1/T4 is suggested for a lower limit, such as0.400≦T1/T4≦0.950.

Reference is now made to Equation (13). ALT/AG23 is composed by twoparameters which require some conditions or show some characters: thesum of the thickness of each lens element (i.e. ALT) is required forshortened for shortening the length of the optical imaging lens, andAG23 is usually relative big as mentioned, and these form a cap of thevalue of ALT/AG23. The value of ALT/AG23 is preferable less than orequal to 9.000 to satisfy Equation (13). Additionally, the value ofALT/AG23 is suggested for a lower limit, such as 6.000≦ALT/AG23≦9.000.

When implementing example embodiments, more details about the convex orconcave surface structure and/or the refracting power may beincorporated for one specific lens element or broadly for plural lenselements to enhance the control for the system performance and/orresolution, as illustrated in the following embodiments. For example,the image-side surface of the first lens element may further comprise aconcave portion in a vicinity of a periphery of the first lens element,the object-side surface of the second lens element may further comprisea convex portion in a vicinity of a periphery of the second lenselement, the image-side surface of the third lens element may furthercomprise a convex portion in a vicinity of the optical axis and/or theobject-side surface of the fifth lens element may further comprise aconcave portion in a vicinity of the optical axis, etc. It is noted thatthe details listed here could be incorporated in example embodiments ifno inconsistency occurs.

Several exemplary embodiments and associated optical data will now beprovided for illustrating example embodiments of optical imaging lenswith good optical characters and a shortened length. Reference is nowmade to FIGS. 2-5. FIG. 2 illustrates an example cross-sectional view ofan optical imaging lens 1 having five lens elements of the opticalimaging lens according to a first example embodiment. FIG. 3 showsexample charts of longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 1 according to anexample embodiment. FIG. 4 illustrates an example table of optical dataof each lens element of the optical imaging lens 1 according to anexample embodiment. FIG. 5 depicts an example table of aspherical dataof the optical imaging lens 1 according to an example embodiment.

As shown in FIG. 2, the optical imaging lens 1 of the present embodimentcomprises, in order from an object side A1 to an image side A2 along anoptical axis, an aperture stop 100, a first lens element 110, a secondlens element 120, a third lens element 130, a fourth lens element 140and a fifth lens element 150. A filtering unit 160 and an image plane170 of an image sensor are positioned at the image side A2 of theoptical lens 1. Each of the first, second, third, fourth, fifth lenselements 110, 120, 130, 140, 150 and the filtering unit 160 comprises anobject-side surface 111/121/131/141/151/161 facing toward the objectside A1 and an image-side surface 112/122/132/142/152/162 facing towardthe image side A2. The example embodiment of the filtering unit 160illustrated is an IR cut filter (infrared cut filter) positioned betweenthe fifth lens element 150 and an image plane 170. The filtering unit160 selectively absorbs light with specific wavelength from the lightpassing optical imaging lens 1. For example, IR light is absorbed, andthis will prohibit the IR light which is not seen by human eyes fromproducing an image on the image plane 170.

Exemplary embodiments of each lens element of the optical imaging lens 1which may be constructed by plastic material will now be described withreference to the drawings.

An example embodiment of the first lens element 110 may have positiverefracting power. The object-side surface 111 is a convex surface, andthe image-side surface 112 is a concave surface comprising a concaveportion 1121 in a vicinity of a periphery of the first lens element 110.

An example embodiment of the second lens element 120 may have negativerefracting power. The object-side surface 121 comprises a convex portion1211 in a vicinity of the optical axis and a concave portion 1212 in avicinity of a periphery of the second lens element 120. The image-sidesurface 122 is a concave surface comprising a concave portion 1221 in avicinity of a periphery of the second lens element 120.

An example embodiment of the third lens element 130 may have positiverefracting power. The object-side surface 131 is a convex surfacecomprising a convex portion 1311 in a vicinity of a periphery of thethird lens element 130. The image-side surface 132 comprises a convexportion 1321 in a vicinity of the optical axis and a concave portion1322 in a vicinity of a periphery of the third lens element 130.

An example embodiment of the fourth lens element 140 may have positiverefracting power. The object-side surface 141 is a concave surface, andthe image-side surface 142 is a convex surface.

An example embodiment of the fifth lens element 150 may have negativerefracting power. The object-side surface 151 comprises a concaveportion 1511 in a vicinity of the optical axis and a concave portion1512 in a vicinity of a periphery of the fifth lens element 150. Theimage-side surface 152 comprises a concave portion 1521 in a vicinity ofthe optical axis and a convex portion 1522 in a vicinity of a peripheryof the fifth lens element 150.

In example embodiments, air gaps exist between the lens elements 110,120, 130, 140, 150, the filtering unit 160 and the image plane 170 ofthe image sensor. For example, FIG. 1 illustrates the air gap d1existing between the first lens element 110 and the second lens element120, the air gap d2 existing between the second lens element 120 and thethird lens element 130, the air gap d3 existing between the third lenselement 130 and the fourth lens element 140, the air gap d4 existingbetween the fourth lens element 140 and the fifth lens element 150, theair gap d5 existing between the fifth lens element 150 and the filteringunit 160, and the air gap d6 existing between the filtering unit 160 andthe image plane 170 of the image sensor. However, in other embodiments,any of the aforesaid air gaps may or may not exist. For example, theprofiles of opposite surfaces of any two adjacent lens elements maycorrespond to each other, and in such situation, the air gap may notexist. The air gap d1 is denoted by AG12, the air gap d3 is denoted byAG34, and the sum of all air gaps d1, d2, d3 and d4 between the firstand fifth lens elements 110, 150 is denoted by AAG.

FIG. 4 depicts the optical characters of each lens elements in theoptical imaging lens 1 of the present embodiment, wherein the values ofALT, AAG, (T1+T5)/T3, AG23/AG12, T5/AG12, T2/AG12, T2/AG23, T3/AG12,AAG/T2, AG34/AG12, T2/T4, T1/AG23, (T5+AG45)/T4, T1/T4 and ALT/AG23 are:

ALT=2.563 (mm);

AAG=1.258 (mm);

(T1+T5)/T3=2.336, satisfying equation (1);

AG23/AG12=1.701, satisfying equation (2);

T5/AG12=2.840, satisfying equation (3);

T2/AG12=1.446, satisfying equation (4);

T2/AG23=0.850, satisfying equation (5);

T3/AG12=2.551, satisfying equation (6);

AAG/T2=5.174, satisfying equation (7);

AG34/AG12=3.212, satisfying equation (8);

T2/T4=0.274, satisfying equation (9);

T1/AG23=1.834, satisfying equation (10);

(T5+AG45)/T4=0.834, satisfying equation (11);

T1/T4=0.590, satisfying equation (12);

ALT/AG23=8.961, satisfying equation (13);

wherein the distance from the object-side surface 111 of the first lenselement 110 to the image plane 170 along the optical axis is 5.151 (mm),and the length of the optical imaging lens 1 is shortened.

The aspherical surfaces, including the object-side surface 111 and theimage-side surface 112 of the first lens element 110, the object-sidesurface 121 and the image-side surface 122 of the second lens element120, the object-side surface 131 and the image-side surface 132 of thethird lens element 130, the object-side surface 141 and the image-sidesurface 142 of the fourth lens element 140, and the object-side surface151 and the image-side surface 152 of the fifth lens element 150 are alldefined by the following aspherical formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{i} \times Y^{i}}}}$

wherein,

R represents the radius of curvature of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant;

a_(i) represents an aspherical coefficient of i^(th) level.

The values of each aspherical parameter are shown in FIG. 5.

As illustrated in FIG. 3, longitudinal spherical aberration (a), thecurves of different wavelengths are closed to each other. Thisrepresents off-axis light with respect to these wavelengths is focusedaround an image point. From the longitudinal deviation of each curveshown therein, the offset of the off-axis light relative to the imagepoint is within ±0.02 (mm). Therefore, the present embodiment improvesthe longitudinal spherical aberration with respect to differentwavelengths.

Please refer to FIG. 3, astigmatism aberration in the sagittal direction(b) and astigmatism aberration in the tangential direction (c). Thefocus variation with respect to the three wavelengths in the whole fieldfalls within ±0.05 (mm). This reflects the optical imaging lens 1 of thepresent embodiment eliminates aberration effectively. Additionally, theclosed curves represents dispersion is improved.

Please refer to FIG. 3, distortion aberration (d), which showing thevariation of the distortion aberration is within ±2%. Such distortionaberration meets the requirement of acceptable image quality and showsthe optical imaging lens 1 of the present embodiment could restrict thedistortion aberration to raise the image quality even though the lengthof the optical imaging lens 1 is shortened to 5.151 mm.

Therefore, the optical imaging lens 1 of the present embodiment showsgreat characteristics in the longitudinal spherical aberration,astigmatism in the sagittal direction, astigmatism in the tangentialdirection, and distortion aberration. According to above illustration,the optical imaging lens 1 of the example embodiment indeed achievesgreat optical performance and the length of the optical imaging lens 1is effectively shortened.

Reference is now made to FIGS. 6-9. FIG. 6 illustrates an examplecross-sectional view of an optical imaging lens 2 having five lenselements of the optical imaging lens according to a second exampleembodiment. FIG. 7 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 2 according to the second example embodiment. FIG. 8 shows anexample table of optical data of each lens element of the opticalimaging lens 2 according to the second example embodiment. FIG. 9 showsan example table of aspherical data of the optical imaging lens 2according to the second example embodiment. The reference numberslabeled in the present embodiment are similar to those in the firstembodiment for the similar elements, but here the reference numbers areinitialed with 2, for example, reference number 231 for labeling theobject-side surface of the third lens element 230, reference number 232for labeling the image-side surface of the third lens element 230, etc.

As shown in FIG. 6, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 200, the first lens element210, a second lens element 220, a third lens element 230, a fourth lenselement 240 and a fifth lens element 250.

The differences between the second embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the object-sidesurface 221 and the image-side surface 232, but the configuration of thepositive/negative refracting power of the first, second, third, fourthand fifth lens elements 210, 220, 230, 240 and 250 and configuration ofthe concave/convex shape of surfaces, comprising the object-sidesurfaces 211, 231, 241, 251 facing to the object side A1 and theimage-side surfaces 212, 222, 242, 252 facing to the image side A2, aresimilar to those in the first embodiment. Specifically, the object-sidesurface 221 of the second lens element 220 and the image-side surface232 of the third lens element 230 are both convex surfaces. Please referto FIG. 8 for the optical characteristics of each lens elements in theoptical imaging lens 2 of the present embodiment, wherein the values ofALT, AAG, (T1+T5)/T3, AG23/AG12, T5/AG12, T2/AG12, T2/AG23, T3/AG12,AAG/T2, AG34/AG12, T2/T4, T1/AG23, (T5+AG45)/T4, T1/T4 and ALT/AG23 are:

ALT=2.725 (mm);

AAG=1.086 (mm);

(T1+T5)/T3=2.387, satisfying equation (1);

AG23/AG12=0.922, satisfying equation (2);

T5/AG12=3.936, satisfying equation (3);

T2/AG12=1.262, satisfying equation (4);

T2/AG23=1.369;

T3/AG12=2.915, satisfying equation (6);

AAG/T2=4.706, satisfying equation (7);

AG34/AG12=3.448;

T2/T4=0.335, satisfying equation (9);

T1/AG23=3.276;

(T5+AG45)/T4=1.195;

T1/T4=0.802, satisfying equation (12);

ALT/AG23=16.158;

wherein the distance from the object-side surface 211 of the first lenselement 210 to the image plane 270 along the optical axis is 5.159 (mm)and the length of the optical imaging lens 2 is shortened.

As shown in FIG. 7, the optical imaging lens 2 of the present embodimentshows great characteristics in longitudinal spherical aberration (a),astigmatism in the sagittal direction (b), astigmatism in the tangentialdirection (c), and distortion aberration (d). Therefore, according tothe above illustration, the optical imaging lens of the presentembodiment indeed shows great optical performance and the length of theoptical imaging lens 2 is effectively shortened.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 3 having five lenselements of the optical imaging lens according to a third exampleembodiment. FIG. 11 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 3 according to the third example embodiment. FIG. 12 shows anexample table of optical data of each lens element of the opticalimaging lens 3 according to the third example embodiment. FIG. 13 showsan example table of aspherical data of the optical imaging lens 3according to the third example embodiment. The reference numbers labeledin the present embodiment are similar to those in the first embodimentfor the similar elements, but here the reference numbers are initialedwith 3, for example, reference number 331 for labeling the object-sidesurface of the third lens element 330, reference number 332 for labelingthe image-side surface of the third lens element 330, etc.

As shown in FIG. 10, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 300, the first lens element310, a second lens element 320, a third lens element 330, a fourth lenselement 340 and a fifth lens element 350.

The differences between the third embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap, the configuration of the positive/negativerefracting power of the fourth and fifth lens elements 340 350 and thesurface shape of the object-side surfaces 321, 331, 351 and theimage-side surface 312, but the configuration of the positive/negativerefracting power of the first, second and third lens elements 310, 320,330 and configuration of the concave/convex shape of surfaces,comprising the object-side surfaces 311, 341 facing to the object sideA1 and the image-side surfaces 322, 332, 342, 352 facing to the imageside A2, are similar to those in the first embodiment. Specifically, theimage-side surface 312 of the first lens element 310 comprises a concaveportion 3121 in a vicinity of the optical axis and a convex portion 3122in a vicinity of a periphery of the first lens element 310, theobject-side surface 321 of the second lens element 320 is a convexsurface, the object-side surface 331 of the third lens element 330comprises a concave portion 3311 in a vicinity of the optical axis, thefourth lens element 340 has negative refracting power, the fifth lenselement 350 has positive refracting power and the object-side surface351 of the fifth lens element 350 comprises a convex portion 3511 in avicinity of the optical axis. Please refer to FIG. 12 for the opticalcharacteristics of each lens elements in the optical imaging lens 3 ofthe present embodiment, wherein the values of ALT, AAG, (T1+T5)/T3,AG23/AG12, T5/AG12, T2/AG12, T2/AG23, T3/AG12, AAG/T2, AG34/AG12, T2/T4,T1/AG23, (T5+AG45)/T4, T1/T4 and ALT/AG23 are:

ALT=2.109 (mm);

AAG=0.960 (mm);

(T1+T5)/T3=2.016, satisfying equation (1);

AG23/AG12=2.182, satisfying equation (2);

T5/AG12=4.396, satisfying equation (3);

T2/AG12=1.667, satisfying equation (4);

T2/AG23=0.764, satisfying equation (5);

T3/AG12=3.732;

AAG/T2=4.159, satisfying equation (7);

AG34/AG12=2.070, satisfying equation (8);

T2/T4=0.721;

T1/AG23=1.433, satisfying equation (10);

(T5+AG45)/T4=2.628;

T1/T4=1.353;

ALT/AG23=6.981, satisfying equation (13);

wherein the distance from the object-side surface 311 of the first lenselement 310 to the image plane 370 along the optical axis is 4.680 (mm)and the length of the optical imaging lens 3 is shortened.

As shown in FIG. 11, the optical imaging lens 3 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 3 is effectively shortened.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 4 having five lenselements of the optical imaging lens according to a fourth exampleembodiment. FIG. 15 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 4 according to the fourth embodiment. FIG. 16 shows an exampletable of optical data of each lens element of the optical imaging lens 4according to the fourth example embodiment. FIG. 17 shows an exampletable of aspherical data of the optical imaging lens 4 according to thefourth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 4, forexample, reference number 431 for labeling the object-side surface ofthe third lens element 430, reference number 432 for labeling theimage-side surface of the third lens element 430, etc.

As shown in FIG. 14, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 400, the first lens element410, a second lens element 420, a third lens element 430, a fourth lenselement 440 and a fifth lens element 450.

The differences between the fourth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap, the configuration of the positive/negativerefracting power of the fourth and fifth lens elements 440 450 and thesurface shape of the object-side surfaces 421, 431, 451, but theconfiguration of the positive/negative refracting power of the first,second and third lens elements 410, 420, 430 and configuration of theconcave/convex shape of surfaces, comprising the object-side surfaces411, 441 facing to the object side A1 and the image-side surfaces 412,422, 432, 442, 452 facing to the image side A2, are similar to those inthe first embodiment. Specifically, the object-side surface 421 of thesecond lens element 420 is a convex surface, the object-side surface 431of the third lens element 430 comprises a concave portion 4311 in avicinity of the optical axis, the fourth lens element 440 has negativerefracting power, the fifth lens element 450 has positive refractingpower and the object-side surface 451 of the fifth lens element 450comprises a convex portion 4511 in a vicinity of the optical axis.Please refer to FIG. 16 for the optical characteristics of each lenselements in the optical imaging lens 4 of the present embodiment,wherein the values of ALT, AAG, (T1+T5)/T3, AG23/AG12, T5/AG12, T2/AG12,T2/AG23, T3/AG12, AAG/T2, AG34/AG12, T2/T4, T1/AG23, (T5+AG45)/T4, T1/T4and ALT/AG23 are:

ALT=2.099 (mm);

AAG=0.938 (mm);

(T1+T5)/T3=1.507, satisfying equation (1);

AG23/AG12=2.201;

T5/AG12=4.144, satisfying equation (3);

T2/AG12=1.770, satisfying equation (4);

T2/AG23=0.804, satisfying equation (5);

T3/AG12=4.571;

AAG/T2=3.941, satisfying equation (7);

AG34/AG12=2.111, satisfying equation (8);

T2/T4=0.744;

T1/AG23=1.246, satisfying equation (10);

(T5+AG45)/T4=2.441;

T1/T4=1.154;

ALT/AG23=7.090, satisfying equation (13);

wherein the distance from the object-side surface 411 of the first lenselement 410 to the image plane 470 along the optical axis is 4.680 (mm)and the length of the optical imaging lens 4 is shortened.

As shown in FIG. 15, the optical imaging lens 4 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 4 is effectively shortened.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 5 having five lenselements of the optical imaging lens according to a fifth exampleembodiment. FIG. 19 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 5 according to the fifth embodiment. FIG. 20 shows an example tableof optical data of each lens element of the optical imaging lens 5according to the fifth example embodiment. FIG. 21 shows an exampletable of aspherical data of the optical imaging lens 5 according to thefifth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 5, forexample, reference number 531 for labeling the object-side surface ofthe third lens element 530, reference number 532 for labeling theimage-side surface of the third lens element 530, etc.

As shown in FIG. 18, the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 500, the first lens element510, a second lens element 520, a third lens element 530, a fourth lenselement 540 and a fifth lens element 550.

The differences between the fifth embodiment and the first embodimentare the radius of curvature and thickness of each lens element and thedistance of each air gap, but the configuration of the positive/negativerefracting power of the first, second, third, fourth and fifth lenselements 510, 520, 530, 540, 550 and configuration of the concave/convexshape of surfaces, comprising the object-side surfaces 511, 521, 531,541, 551 facing to the object side A1 and the image-side surfaces 512,522, 532, 542, 552 facing to the image side A2, are similar to those inthe first embodiment. Please refer to FIG. 20 for the opticalcharacteristics of each lens elements in the optical imaging lens 5 ofthe present embodiment, wherein the values of ALT, AAG, (T1+T5)/T3,AG23/AG12, T5/AG12, T2/AG12, T2/AG23, T3/AG12, AAG/T2, AG34/AG12, T2/T4,T1/AG23, (T5+AG45)/T4, T1/T4 and ALT/AG23 are:

ALT=2.680 (mm);

AAG=1.213 (mm);

(T1+T5)/T3=2.378, satisfying equation (1);

AG23/AG12=2.003, satisfying equation (2);

T5/AG12=3.468, satisfying equation (3);

T2/AG12=2.119, satisfying equation (4);

T2/AG23=1.058;

T3/AG12=2.787, satisfying equation (6);

AAG/T2=3.784, satisfying equation (7);

AG34/AG12=3.405;

T2/T4=0.343, satisfying equation (9);

T1/AG23=1.578, satisfying equation (10);

(T5+AG45)/T4=0.822, satisfying equation (11);

T1/T4=0.511, satisfying equation (12);

ALT/AG23=8.844, satisfying equation (13);

wherein the distance from the object-side surface 511 of the first lenselement 510 to the image plane 570 along the optical axis is 5.150 (mm)and the length of the optical imaging lens 5 is shortened.

As shown in FIG. 19, the optical imaging lens 5 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 5 is effectively shortened.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 6 having five lenselements of the optical imaging lens according to a sixth exampleembodiment. FIG. 23 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 6 according to the sixth embodiment. FIG. 24 shows an example tableof optical data of each lens element of the optical imaging lens 6according to the sixth example embodiment. FIG. 25 shows an exampletable of aspherical data of the optical imaging lens 6 according to thesixth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 6, forexample, reference number 631 for labeling the object-side surface ofthe third lens element 630, reference number 632 for labeling theimage-side surface of the third lens element 630, etc.

As shown in FIG. 22, the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 600, the first lens element610, a second lens element 620, a third lens element 630, a fourth lenselement 640 and a fifth lens element 650.

The differences between the sixth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the object-sidesurface 621, but the configuration of the positive/negative refractingpower of the first, second, third, fourth and fifth lens elements 610,620, 630, 640, 650 and configuration of the concave/convex shape ofsurfaces, comprising the object-side surfaces 611, 631, 641, 651 facingto the object side A1 and the image-side surfaces 612, 622, 632, 642,652 facing to the image side A2, are similar to those in the firstembodiment. Specifically, the object-side surface 621 of the second lenselement 620 is a convex surface. Please refer to FIG. 24 for the opticalcharacteristics of each lens elements in the optical imaging lens 6 ofthe present embodiment, wherein the values of ALT, AAG, (T1+T5)/T3,AG23/AG12, T5/AG12, T2/AG12, T2/AG23, T3/AG12, AAG/T2, AG34/AG12, T2/T4,T1/AG23, (T5+AG45)/T4, T1/T4 and ALT/AG23 are:

ALT=2.531 (mm);

AAG=1.389 (mm);

(T1+T5)/T3=2.206, satisfying equation (1);

AG23/AG12=1.403, satisfying equation (2);

T5/AG12=2.226, satisfying equation (3);

T2/AG12=1.336, satisfying equation (4);

T2/AG23=0.952, satisfying equation (5);

T3/AG12=2.370, satisfying equation (6);

AAG/T2=5.606, satisfying equation (7);

AG34/AG12=3.338, satisfying equation (8);

T2/T4=0.283, satisfying equation (9);

T1/AG23=2.140;

(T5+AG45)/T4=0.843, satisfying equation (11);

T1/T4=0.637, satisfying equation (12);

ALT/AG23=9.725;

wherein the distance from the object-side surface 611 of the first lenselement 610 to the image plane 670 along the optical axis is 5.153 (mm)and the length of the optical imaging lens 6 is shortened.

As shown in FIG. 23, the optical imaging lens 6 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 6 is effectively shortened.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 7 having five lenselements of the optical imaging lens according to a seventh exampleembodiment. FIG. 27 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 7 according to the seventh embodiment. FIG. 28 shows an exampletable of optical data of each lens element of the optical imaging lens 7according to the seventh example embodiment. FIG. 29 shows an exampletable of aspherical data of the optical imaging lens 7 according to theseventh example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 7, forexample, reference number 731 for labeling the object-side surface ofthe third lens element 730, reference number 732 for labeling theimage-side surface of the third lens element 730, etc.

As shown in FIG. 26, the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 700, the first lens element710, a second lens element 720, a third lens element 730, a fourth lenselement 740 and a fifth lens element 750.

The differences between the seventh embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the image-side surface712, but the configuration of the positive/negative refracting power ofthe first, second, third, fourth and fifth lens elements 710, 720, 730,740, 750 and configuration of the concave/convex shape of surfaces,comprising the object-side surfaces 711, 721, 731, 741, 751 facing tothe object side A1 and the image-side surfaces 722, 732, 742, 752 facingto the image side A2, are similar to those in the first embodiment.Specifically, the image-side surface 712 of the first lens element 710comprises a convex portion 7121 in a vicinity of a periphery of thefirst lens element 710. Please refer to FIG. 28 for the opticalcharacteristics of each lens elements in the optical imaging lens 7 ofthe present embodiment, wherein the values of ALT, AAG, (T1+T5)/T3,AG23/AG12, T5/AG12, T2/AG12, T2/AG23, T3/AG12, AAG/T2, AG34/AG12, T2/T4,T1/AG23, (T5+AG45)/T4, T1/T4 and ALT/AG23 are:

ALT=2.948 (mm);

AAG=0.889 (mm);

(T1+T5)/T3=2.356, satisfying equation (1);

AG23/AG12=1.045, satisfying equation (2);

T5/AG12=4.360, satisfying equation (3);

T2/AG12=1.482, satisfying equation (4);

T2/AG23=1.418;

T3/AG12=3.531;

AAG/T2=3.654, satisfying equation (7);

AG34/AG12=3.035, satisfying equation (8);

T2/T4=0.320, satisfying equation (9);

T1/AG23=3.791;

(T5+AG45)/T4=1.013, satisfying equation (11);

T1/T4=0.855, satisfying equation (12);

ALT/AG23=17.199;

wherein the distance from the object-side surface 711 of the first lenselement 710 to the image plane 770 along the optical axis is 5.155 (mm)and the length of the optical imaging lens 7 is shortened.

As shown in FIG. 27, the optical imaging lens 7 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 7 is effectively shortened.

Reference is now made to FIGS. 30-33. FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 8 having five lenselements of the optical imaging lens according to a eighth exampleembodiment. FIG. 31 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 8 according to the eighth embodiment. FIG. 32 shows an exampletable of optical data of each lens element of the optical imaging lens 8according to the eighth example embodiment. FIG. 33 shows an exampletable of aspherical data of the optical imaging lens 8 according to theeighth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 8, forexample, reference number 831 for labeling the object-side surface ofthe third lens element 830, reference number 832 for labeling theimage-side surface of the third lens element 830, etc.

As shown in FIG. 30, the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 800, the first lens element810, a second lens element 820, a third lens element 830, a fourth lenselement 840 and a fifth lens element 850.

The differences between the eighth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap, the configuration of the positive/negativerefracting power of the fourth and fifth lens elements 840, 850 and thesurface shape of the object-side surfaces 821, 851, but theconfiguration of the positive/negative refracting power of the first,second, third lens elements 810, 820, 830 and configuration of theconcave/convex shape of surfaces, comprising the object-side surfaces811, 831, 841 facing to the object side A1 and the image-side surfaces812, 822, 832, 842, 852 facing to the image side A2, are similar tothose in the first embodiment. Specifically, the object-side surface 821of the second lens element 820 is a convex surface, the fourth lenselement 840 has negative refracting power, the fifth lens element 850has positive refracting power, and the object-side surface 851 of thefifth lens element 850 comprises a convex portion 8511 in a vicinity ofthe optical axis. Please refer to FIG. 32 for the opticalcharacteristics of each lens elements in the optical imaging lens 8 ofthe present embodiment, wherein the values of ALT, AAG, (T1+T5)/T3,AG23/AG12, T5/AG12, T2/AG12, T2/AG23, T3/AG12, AAG/T2, AG34/AG12, T2/T4,T1/AG23, (T5+AG45)/T4, T1/T4 and ALT/AG23 are:

ALT=2.308 (mm);

AAG=0.793 (mm);

(T1+T5)/T3=2.308, satisfying equation (1);

AG23/AG12=1.489, satisfying equation (2);

T5/AG12=4.395, satisfying equation (3);

T2/AG12=1.197, satisfying equation (4);

T2/AG23=0.804, satisfying equation (5);

T3/AG12=2.959, satisfying equation (6);

AAG/T2=3.869, satisfying equation (7);

AG34/AG12=1.840, satisfying equation (8);

T2/T4=0.479, satisfying equation (9);

T1/AG23=1.634, satisfying equation (10);

(T5+AG45)/T4=1.880;

T1/T4=0.974;

ALT/AG23=9.054;

wherein the distance from the object-side surface 811 of the first lenselement 810 to the image plane 870 along the optical axis is 4.680 (mm)and the length of the optical imaging lens 8 is shortened.

As shown in FIG. 31, the optical imaging lens 8 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 8 is effectively shortened.

Reference is now made to FIGS. 34-37. FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 9 having five lenselements of the optical imaging lens according to a ninth exampleembodiment. FIG. 35 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 9 according to the ninth embodiment. FIG. 36 shows an example tableof optical data of each lens element of the optical imaging lens 9according to the ninth example embodiment. FIG. 37 shows an exampletable of aspherical data of the optical imaging lens 9 according to theninth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 9, forexample, reference number 931 for labeling the object-side surface ofthe third lens element 930, reference number 932 for labeling theimage-side surface of the third lens element 930, etc.

As shown in FIG. 34, the optical imaging lens 9 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 900, the first lens element910, a second lens element 920, a third lens element 930, a fourth lenselement 940 and a fifth lens element 950.

The differences between the ninth embodiment and the eighth embodimentare the radius of curvature and thickness of each lens element and thedistance of each air gap, but the configuration of the positive/negativerefracting power of the first, second, third, fourth and fifth lenselements 910, 920, 930, 940, 950 and configuration of the concave/convexshape of surfaces, comprising the object-side surfaces 911, 921, 931,941, 951 facing to the object side A1 and the image-side surfaces 912,922, 932, 942, 952 facing to the image side A2, are similar to those inthe eighth embodiment. Please refer to FIG. 36 for the opticalcharacteristics of each lens elements in the optical imaging lens 9 ofthe present embodiment, wherein the values of ALT, AAG, (T1+T5)/T3,AG23/AG12, T5/AG12, T2/AG12, T2/AG23, T3/AG12, AAG/T2, AG34/AG12, T2/T4,T1/AG23, (T5+AG45)/T4, T1/T4 and ALT/AG23 are:

ALT=2.340 (mm);

AAG=0.787 (mm);

(T1+T5)/T3=2.335, satisfying equation (1);

AG23/AG12=1.424, satisfying equation (2);

T5/AG12=4.395, satisfying equation (3);

T2/AG12=1.146, satisfying equation (4);

T2/AG23=0.804, satisfying equation (5);

T3/AG12=2.856, satisfying equation (6);

AAG/T2=3.837, satisfying equation (7);

AG34/AG12=1.677, satisfying equation (8);

T2/T4=0.478, satisfying equation (9);

T1/AG23=1.597, satisfying equation (10);

(T5+AG45)/T4=1.958;

T1/T4=0.950, satisfying equation (12);

ALT/AG23=9.174;

wherein the distance from the object-side surface 911 of the first lenselement 910 to the image plane 970 along the optical axis is 4.680 (mm)and the length of the optical imaging lens 9 is shortened.

As shown in FIG. 35, the optical imaging lens 9 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 9 is effectively shortened.

Please refer to FIG. 38, which shows the values of ALT, AAG, (T1+T5)/T3,AG23/AG12, T5/AG12, T2/AG12, T2/AG23, T3/AG12, AAG/T2, AG34/AG12, T2/T4,T1/AG23, (T5+AG45)/T4, T1/T4 and ALT/AG23 of all ninth embodiments, andit is clear that the optical imaging lens of the present inventionsatisfy the Equations (1), (2), (3), (4), (5), (6), (7), (8), (9), (10,(11), (12) and/or (13).

Reference is now made to FIG. 39, which illustrates an examplestructural view of a first embodiment of mobile device 20 applying anaforesaid optical imaging lens. The mobile device 20 comprises a housing21 and a photography module 22 positioned in the housing 21. Examples ofthe mobile device 20 may be, but are not limited to, a mobile phone, acamera, a tablet computer, a personal digital assistant (PDA), etc.

As shown in FIG. 39, the photography module 22 may comprise an aforesaidoptical imaging lens with five lens elements, for example the opticalimaging lens 1 of the first embodiment, a lens barrel 23 for positioningthe optical imaging lens 1, a module housing unit 24 for positioning thelens barrel 23, a substrate 172 for positioning the module housing unit24, and an image sensor 171 which is positioned at an image side of theoptical imaging lens 1. The image plane 170 is formed on the imagesensor 171.

In some other example embodiments, the structure of the filtering unit160 may be omitted. In some example embodiments, the housing 21, thelens barrel 23, and/or the module housing unit 24 may be integrated intoa single component or assembled by multiple components. In some exampleembodiments, the image sensor 171 used in the present embodiment isdirectly attached to a substrate 172 in the form of a chip on board(COB) package, and such package is different from traditional chip scalepackages (CSP) since COB package does not require a cover glass beforethe image sensor 171 in the optical imaging lens 1. Aforesaid exemplaryembodiments are not limited to this package type and could beselectively incorporated in other described embodiments.

The five lens elements 110, 120, 130, 140, 150 are positioned in thelens barrel 23 in the way of separated by an air gap between any twoadjacent lens elements.

The module housing unit 24 comprises a lens backseat 2401 forpositioning the lens barrel 23 and an image sensor base 2406 positionedbetween the lens backseat 2401 and the image sensor 171. The lens barrel23 and the lens backseat 2401 are positioned along a same axis I-I′, andthe lens backseat 2401 is close to the outside of the lens barrel 23.The image sensor base 2406 is exemplarily close to the lens backseat2401 here. The image sensor base 2406 could be optionally omitted insome other embodiments of the present invention.

Because the length of the optical imaging lens 1 is merely 5.151 mm, thesize of the mobile device 20 may be quite small. Therefore, theembodiments described herein meet the market demand for smaller sizedproduct designs.

Reference is now made to FIG. 40, which shows another structural view ofa second embodiment of mobile device 20′ applying the aforesaid opticalimaging lens 1. One difference between the mobile device 20′ and themobile device 20 may be the lens backseat 2401 comprising a first seatunit 2402, a second seat unit 2403, a coil 2404 and a magnetic unit2405. The first seat unit 2402 is close to the outside of the lensbarrel 23, and positioned along an axis I-I′, and the second seat unit2403 is around the outside of the first seat unit 2402 and positionedalong with the axis I-I′. The coil 2404 is positioned between the firstseat unit 2402 and the inside of the second seat unit 2403. The magneticunit 2405 is positioned between the outside of the coil 2404 and theinside of the second seat unit 2403.

The lens barrel 23 and the optical imaging lens 1 positioned therein aredriven by the first seat unit 2402 for moving along the axis I-I′. Therest structure of the mobile device 20′ is similar to the mobile device20.

Similarly, because the length of the optical imaging lens 1, 5.151 mm,is shortened, the mobile device 20′ may be designed with a smaller sizeand meanwhile good optical performance is still provided. Therefore, thepresent embodiment meets the demand of small sized product design andthe request of the market.

According to above illustration, it is clear that the mobile device andthe optical imaging lens thereof in example embodiments, throughcontrolling the detail structure and/or reflection power of the lenselements, the length of the optical imaging lens is effectivelyshortened and meanwhile good optical characters are still provided.

While various embodiments in accordance with the disclosed principlesbeen described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens, sequencially from anobject side to an image side along an optical axis, comprising anaperture stop, first, second, third, fourth and fifth lens elements,each of said first, second, third, fourth and fifth lens elements havingan object-side surface facing toward the object side and an image-sidesurface facing toward the image side, wherein: said first lens elementhas positive refracting power, and said object-side surface thereof is aconvex surface; said second lens element has negative refracting power,and said image-side surface thereof comprises a concave portion in avicinity of a periphery of the second lens element; said object-sidesurface of said third lens element comprises a convex portion in avicinity of a periphery of the third lens element; said object-sidesurface of said fourth lens element is a concave surface; saidobject-side surface of said fifth lens element comprises a concaveportion in a vicinity of a periphery of the fifth lens element, and saidimage-side surface of said fifth lens element comprises a concaveportion in a vicinity of the optical axis and a convex portion in avicinity of a periphery of the fifth lens element; and the opticalimaging lens as a whole comprises only the five lens elements havingrefracting power.
 2. The optical imaging lens according to claim 1,wherein a central thickness of the first lens element along the opticalaxis is T1, a central thickness of the third lens element along theoptical axis is T3, a central thickness of the fifth lens element alongthe optical axis is T5 and T1, T3 and T5 satisfy the equation:(T1+T5)/T3≦2.400.
 3. The optical imaging lens according to claim 2,wherein an air gap between the first lens element and the second lenselement along the optical axis is AG12, an air gap between the secondlens element and the third lens element along the optical axis is AG23,and AG12 and AG23 satisfy the equation:AG23/AG12≦2.200.
 4. The optical imaging lens according to claim 3,wherein a central thickness of the second lens element along the opticalaxis is T2, and AG12 and T2 satisfy the equation:T2/AG12≦2.300.
 5. The optical imaging lens according to claim 4, whereinsaid object-side surface of said second lens element comprises a convexportion in a vicinity of a periphery of the second lens element.
 6. Theoptical imaging lens according to claim 3, wherein a central thicknessof the second lens element along the optical axis is T2, and AG23 and T2satisfy the equation:T2/AG23≦1.000.
 7. The optical imaging lens according to claim 3, whereinAG12 and T3 satisfy the equation:T3/AG12≦3.000.
 8. The optical imaging lens according to claim 7, whereinsaid object-side surface of said second lens element comprises a convexportion in a vicinity of a periphery of the second lens element.
 9. Theoptical imaging lens according to claim 3, wherein said object-sidesurface of said fifth lens element comprises a concave portion in avicinity of the optical axis.
 10. The optical imaging lens according toclaim 9, wherein a central thickness of the second lens element alongthe optical axis is T2, the sum of all four air gaps from the first lenselement to the fifth lens element along the optical axis is AAG, and T2and AAG satisfy the equation:3.450≦AAG/T2.
 11. The optical imaging lens according to claim 2, whereina central thickness of the fifth lens element along the optical axis isT5, an air gap between the first lens element and the second lenselement along the optical axis is AG12, and T5 and AG12 satisfy theequation:T5/AG12≦4.400.
 12. The optical imaging lens according to claim 11,wherein an air gap between the third lens element and the fourth lenselement along the optical axis is AG34, and AG12 and AG34 satisfy theequation:AG34/AG12≦3.400.
 13. The optical imaging lens according to claim 12,wherein a central thickness of the second lens element along the opticalaxis is T2, a central thickness of the fourth lens element along theoptical axis is T4, and T2 and T4 satisfy the equation:T2/T4≦0.480.
 14. The optical imaging lens according to claim 12, whereina central thickness of the first lens element along the optical axis isT1, an air gap between the second lens element and the third lenselement along the optical axis is AG23, and T1 and AG23 satisfy theequation:T1/AG23≦2.050.
 15. The optical imaging lens according to claim 1,wherein an air gap between the first lens element and the second lenselement along the optical axis is AG12, an air gap between the secondlens element and the third lens element along the optical axis is AG23,and AG12 and AG23 satisfy the equation:AG23/AG12≦2.200.
 16. The optical imaging lens according to claim 15,wherein a central thickness of the fourth lens element along the opticalaxis is T4, a central thickness of the fifth lens element along theoptical axis is T5, an air gap between the fourth lens element and thefifth lens element along the optical axis is AG45, and T4, T5 and AG45satisfy the equation:(T5+AG45)/T4≦1.150.
 17. The optical imaging lens according to claim 1,wherein a central thickness of the fifth lens element along the opticalaxis is T5, an air gap between the first lens element and the secondlens element along the optical axis is AG12, and T5 and AG12 satisfy theequation:T5/AG12≦4.400.
 18. The optical imaging lens according to claim 17wherein a central thickness of the first lens element along the opticalaxis is T1, a central thickness of the fourth lens element along theoptical axis is T4, and T1 and T4 satisfy the equation:T1/T4≦0.950.
 19. The optical imaging lens according to claim 17, whereinan air gap between the second lens element and the third lens elementalong the optical axis is AG23, the sum of the thickness of all fivelens elements along the optical axis is ALT, and AG23 and ALT satisfythe equation:ALT/AG23≦9.000.
 20. A mobile device, comprising: a housing; and aphotography module positioned in the housing and comprising: the opticalimaging lens as claimed in claim 1; a lens barrel for positioning theoptical imaging lens; a module housing unit for positioning the lensbarrel; a substrate for positioning the module housing unit; and animage sensor positioned on the substrate and at the image side of theoptical imaging lens.